I just read a great post on checking the electrical on the stator, coil and pickup coil.
It was posted by
zeroclient in this thread:
viewtopic.php?f=1&t=18349There are 3 coils on that stator. Only 2 of them are meant for starting and running the Engine. The 3rd is there for lights and charging a battery if you have E-Start.
Pre-step - REMOVE YOUR SPARK PLUG to make these tests much easier
1. The trigger coil is common to fail. Lets check it.
a. Get your Digital Volt Meter out and set it to OHMs.
b. Put the leads of the DVM across the (G)reen and (BL/Y) (Blue/Yellow strip) and take a reading. It should measure between 100~400 Ohms.
c. Next, set your DVM to AC voltage keeping the leads on the same wires as b.
d. Either yank the pull start or turn the
Engine over by the starter
motor ((
Internal Combustion Engine ? )) (( Internal Combustion Engine ? )).
e. You should see the DVM 'blip' up to about 0.4 volts AC.
Final - If it doesn't move, IE stays at ZERO volts, ZERO ohms, or open, then your small trigger coil is bad.
2. The charge coil is used to run and charge the
CDI (Capacitor Discharge Ignition) (Capacitor Discharge Ignition). Its responsible for creating the voltage in order for the CDI (Capacitor Discharge Ignition) (Capacitor Discharge Ignition) to send a signal to the coil which then creates spark across the spark plug.
a. With your DVM, place the BLACK lead securely to ground. Anywhere on the Engine would be best - Metal surface.
b. Attach the RED lead of your DVM to (B/R) which is Black with a Red Stripe.
c. Set the DVM to AC voltage
d. Either yank the pull start or crank the starter
e. You should see the DVM blip anywhere from maybe 5 to 50 Volts. Thought it may be tough to see this on the DVM, just remember it must blip to something much higher than 0 volts to test good.
Note: If you have a DVM with a peak-hold function then you'll get more accurate peak hold AV voltage readings from the above.
Finally. Lets test your ignition coil near the spark plug. Resistance using OHM settings on your DVM - the coil should measure about 5k-10k going from spade terminal to high voltage lead at the plug. Any more and there is a problem. The coil should also measure close to 0 ohms from one terminal to the other terminal. If it measures open then it might be bad.